I was extremely production last night. I hope I wasn't unsociable at the in-laws' but I got over 5 inches done in total yesterday. Unfortunately, this morning was the first time I measured it lying truly flat and it's an inch too narrow. I might try to block it out wider. If that doesn't work, I'll stitch a border or something. I am not starting over again!
Not to self, always, always, always lay the item you are making on a flat surface to measure!